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          LV09-01-pinctrl和gpio子系统-02-虚拟pinctrl驱动实例
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    <div class="post-body" itemprop="articleBody"><p>来写一个虚拟的pinctrl子系统的驱动程序？。若笔记中有错误或者不合适的地方，欢迎批评指正😃。</p>
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<details class="folding-tag" blue><summary> 点击查看使用工具及版本 </summary>
              <div class='content'>
              <table>    <tr>        <td align="center" rowspan="5">PC端开发环境</td>        <td align="center" width=150px>Windows</td>        <td align="left">Windows11</td>    </tr>    <tr>        <td align="center">Ubuntu</td>        <td align="left">Ubuntu20.04.2的64位版本</td>      </tr>    <tr>        <td align="center">VMware® Workstation 17 Pro</td>        <td align="left">17.6.0 build-24238078</td>      </tr>    <tr>        <td align="center">终端软件</td>        <td align="left">MobaXterm(Professional Edition v23.0 Build 5042 (license))</td>    </tr>    <tr>        <td align="center">Win32DiskImager</td>        <td align="left">Win32DiskImager v1.0</td>      </tr>    <tr>        <td align="center" rowspan="3">Linux开发板环境</td>        <td align="center">Linux开发板</td>        <td align="left">正点原子 i.MX6ULL Linux 阿尔法开发板</td>      </tr>    <tr>        <td align="center">uboot</td>        <td align="left">NXP官方提供的uboot，使用的uboot版本为U-Boot 2019.04</td>      </tr>    <tr>        <td align="center">linux内核</td>        <td align="left">linux-4.19.71(NXP官方提供)</td>      </tr></table>
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<details class="folding-tag" blue><summary> 点击查看本文参考资料 </summary>
              <div class='content'>
              <table>    <tr>        <td align="center">分类</td>        <td align="center">网址</td>        <td align="center">说明</td>    </tr>    <tr>        <td align="center" rowspan="5">官方网站</td>        <td align="left"><a href="https://www.arm.com/" target="_blank">https://www.arm.com/</a></td>        <td align="left">ARM官方网站，在这里我们可以找到Cotex-Mx以及ARMVx的一些文档</td>    </tr>    <tr>        <td align="left"><a href="https://www.nxp.com.cn/" target="_blank">https://www.nxp.com.cn/ </a></td>        <td align="left">NXP官方网站</td>    </tr>    <tr>        <td align="left"><a href="https://www.nxpic.org.cn/" target="_blank">https://www.nxpic.org.cn/</a></td><td align="left">NXP 官方社区</td>    </tr>    <tr>        <td align="left"><a href="https://u-boot.readthedocs.io/en/latest/" target="_blank">https://u-boot.readthedocs.io/en/latest/</a></td><td align="left">u-boot官网</td>    </tr>    <tr>        <td align="left"><a href="https://www.kernel.org/" target="_blank">https://www.kernel.org/</a></td><td align="left">linux内核官网</td>    </tr></table>
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<details class="folding-tag" blue><summary> 点击查看相关文件下载 </summary>
              <div class='content'>
              <table>    <tr>        <td align="center">分类</td>        <td align="center">网址</td>        <td align="center">说明</td>    </tr>    <tr>        <td align="center" rowspan="3">NXP</td>        <td align="left"><a href="https://github.com/nxp-imx" target="_blank">https://github.com/nxp-imx</a></td>        <td align="left">NXP imx开发资源GitHub组织，里边会有u-boot和linux内核的仓库</td>    </tr>    <tr>        <td align="left"><a href="https://github.com/nxp-imx/linux-imx/releases/tag/v4.19.71" target="_blank">nxp-imx/linux-imx/releases/tag/v4.19.71</a></td>        <td align="left">NXP linux内核仓库tags中的v4.19.71</td>    </tr>    <tr>        <td align="left"><a href="https://github.com/nxp-imx/uboot-imx/releases/tag/rel_imx_4.19.35_1.1.0" target="_blank">nxp-imx/uboot-imx/releases/tag/rel_imx_4.19.35_1.1.0</a></td>        <td align="left">NXP u-boot仓库tags中的rel_imx_4.19.35_1.1.0</td>    </tr>    <tr>        <td align="center" rowspan="2">I.MX6ULL</td>        <td align="left"><a href="https://www.nxp.com.cn/docs/en/data-sheet/IMX6ULLIEC.pdf" target="_blank">i.MX 6ULL Applications Processors for Industrial Products</a></td>        <td align="left">I.MX6ULL 芯片手册（datasheet，可以在线查看）</td>    </tr>    <tr>        <td align="left"><a href="https://www.nxp.com.cn/webapp/Download?colCode=IMX6ULLRM&lang_cd=zh" target="_blank">i.MX 6ULL Applications ProcessorReference Manual</a></td>        <td align="left">I.MX6ULL 参考手册（下载后才能查看，需要登录NXP官网）</td>    </tr>    <tr>        <td align="center" rowspan="3">Source Code</td>        <td align="left"><a href="https://elixir.bootlin.com/linux/latest/source" target="_blank">https://elixir.bootlin.com/linux/latest/source</a></td>        <td align="left">linux kernel源码</td>    </tr>    <tr>        <td align="left"><a href="https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tree/?h=v4.19.71&id=e7d2672c66e4d3675570369bf20856296da312c4" target="_blank">kernel/git/stable/linux.git - Linux kernel stable tree</a></td>        <td align="left">linux kernel源码(官网,tag 4.19.71)</td>    </tr>    <tr>        <td align="left"><a href="https://elixir.bootlin.com/u-boot/latest/source" target="_blank">https://elixir.bootlin.com/u-boot/latest/source</a></td>        <td align="left">uboot源码</td>    </tr></table>
              </div>
            </details>

<h1 id="一、编写pinctrl驱动程序要做什么？"><a href="#一、编写pinctrl驱动程序要做什么？" class="headerlink" title="一、编写pinctrl驱动程序要做什么？"></a><font size=3>一、编写pinctrl驱动程序要做什么？</font></h1><h2 id="1-pinctrl三大作用"><a href="#1-pinctrl三大作用" class="headerlink" title="1. pinctrl三大作用"></a><font size=3>1. pinctrl三大作用</font></h2><ul>
<li>（1）引脚枚举与命名(Enumerating and naming)：包括单个引脚和各组引脚。</li>
<li>（2）引脚复用(Multiplexing)：比如用作GPIO、I2C或其他功能。</li>
<li>（3）引脚配置(Configuration)：比如上拉、下拉、open drain、驱动强度等。</li>
</ul>
<h2 id="2-做哪些事？"><a href="#2-做哪些事？" class="headerlink" title="2. 做哪些事？"></a><font size=3>2. 做哪些事？</font></h2><ul>
<li><strong>pin controller：</strong></li>
</ul>
<p>（1）创建设备树节点</p>
<img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/02IMX6ULL%E5%B9%B3%E5%8F%B0/LV09-pinctrl%E5%92%8Cgpio%E5%AD%90%E7%B3%BB%E7%BB%9F/LV09-01-pinctrl%E5%92%8Cgpio%E5%AD%90%E7%B3%BB%E7%BB%9F-02-%E8%99%9A%E6%8B%9Fpinctrl%E9%A9%B1%E5%8A%A8%E5%AE%9E%E4%BE%8B/img/12_pinctrl_dts_modules.png"  />

<p>（2）编写驱动程序</p>
<ul>
<li><strong>开发板测试</strong></li>
</ul>
<p>（1）创建client设备树节点</p>
<p>（2）编写驱动程序</p>
<h1 id="二、编写虚拟pinctrl程序实例"><a href="#二、编写虚拟pinctrl程序实例" class="headerlink" title="二、编写虚拟pinctrl程序实例"></a><font size=3>二、编写虚拟pinctrl程序实例</font></h1><h2 id="1-硬件功能"><a href="#1-硬件功能" class="headerlink" title="1. 硬件功能"></a><font size=3>1. 硬件功能</font></h2><p>假设这个虚拟的pin controller有4个引脚：</p>
<img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/02IMX6ULL%E5%B9%B3%E5%8F%B0/LV09-pinctrl%E5%92%8Cgpio%E5%AD%90%E7%B3%BB%E7%BB%9F/LV09-01-pinctrl%E5%92%8Cgpio%E5%AD%90%E7%B3%BB%E7%BB%9F-02-%E8%99%9A%E6%8B%9Fpinctrl%E9%A9%B1%E5%8A%A8%E5%AE%9E%E4%BE%8B/img/image-20250401162348111.png" alt="image-20250401162348111"  />

<ul>
<li>pin0,1,2,3都可以配置为GPIO功能。</li>
<li>pin0,1还可以配置为I2C功能。</li>
<li>pin2,3还可以配置为UART功能。</li>
</ul>
<h2 id="2-编写设备树文件"><a href="#2-编写设备树文件" class="headerlink" title="2. 编写设备树文件"></a><font size=3>2. 编写设备树文件</font></h2><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br></pre></td><td class="code"><pre><span class="line">/ &#123;</span><br><span class="line">	model = <span class="string">&quot;Freescale i.MX6 UlltraLite ALPHA EMMC Board&quot;</span>;</span><br><span class="line">	compatible = <span class="string">&quot;fsl,imx6ull-alpha-emmc&quot;</span>, <span class="string">&quot;fsl,imx6ull&quot;</span>;</span><br><span class="line"></span><br><span class="line">    alpha &#123;</span><br><span class="line">        <span class="meta">#address-cells = <span class="string">&lt;1&gt;</span>;</span></span><br><span class="line">        <span class="meta">#size-cells = <span class="string">&lt;1&gt;</span>;</span></span><br><span class="line">        compatible = <span class="string">&quot;simple-bus&quot;</span>;</span><br><span class="line">        <span class="comment">//......</span></span><br><span class="line">        virtual_pincontroller &#123;</span><br><span class="line">            compatible = <span class="string">&quot;alpha,virtual_pinctrl&quot;</span>;</span><br><span class="line">            i2cgrp: i2cgrp &#123;</span><br><span class="line">                functions = <span class="string">&quot;i2c&quot;</span>, <span class="string">&quot;i2c&quot;</span>;</span><br><span class="line">                groups = <span class="string">&quot;pin0&quot;</span>, <span class="string">&quot;pin1&quot;</span>;</span><br><span class="line">                configs = &lt;<span class="number">0x11223344</span>  <span class="number">0x55667788</span>&gt;;</span><br><span class="line">            &#125;;</span><br><span class="line">        &#125;;</span><br><span class="line"></span><br><span class="line">        virtual_i2c &#123;</span><br><span class="line">            compatible = <span class="string">&quot;alpha,virtual_i2c&quot;</span>;</span><br><span class="line">            pinctrl-names = <span class="string">&quot;default&quot;</span>;</span><br><span class="line">            pinctrl<span class="number">-0</span> = &lt;&amp;i2cgrp&gt;;</span><br><span class="line">        &#125;;</span><br><span class="line">    &#125;;</span><br><span class="line">&#125;;</span><br><span class="line"></span><br></pre></td></tr></table></figure>

<p>编译完设备树，就更新到开发板上去。更新成功可以看到如下节点：</p>
<img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/02IMX6ULL%E5%B9%B3%E5%8F%B0/LV09-pinctrl%E5%92%8Cgpio%E5%AD%90%E7%B3%BB%E7%BB%9F/LV09-01-pinctrl%E5%92%8Cgpio%E5%AD%90%E7%B3%BB%E7%BB%9F-02-%E8%99%9A%E6%8B%9Fpinctrl%E9%A9%B1%E5%8A%A8%E5%AE%9E%E4%BE%8B/img/image-20250402194357273.png" alt="image-20250402194357273" />

<h2 id="3-驱动程序"><a href="#3-驱动程序" class="headerlink" title="3. 驱动程序"></a><font size=3>3. 驱动程序</font></h2><h3 id="3-1-pinctrl驱动"><a href="#3-1-pinctrl驱动" class="headerlink" title="3.1 pinctrl驱动"></a><font size=3>3.1 pinctrl驱动</font></h3><p>核心是pinctrl_desc：分配、设置和注册pinctrl_desc结构体。这里是一个platform_driver。</p>
<h3 id="3-2-client驱动"><a href="#3-2-client驱动" class="headerlink" title="3.2 client驱动"></a><font size=3>3.2 client驱动</font></h3><p>编写、注册一个platform_driver即可。</p>
<h1 id="三、调试虚拟的pinctrl"><a href="#三、调试虚拟的pinctrl" class="headerlink" title="三、调试虚拟的pinctrl"></a><font size=3>三、调试虚拟的pinctrl</font></h1><h2 id="1-开发板准备"><a href="#1-开发板准备" class="headerlink" title="1. 开发板准备"></a><font size=3>1. 开发板准备</font></h2><h3 id="1-1-设备树"><a href="#1-1-设备树" class="headerlink" title="1.1 设备树"></a><font size=3>1.1 设备树</font></h3><p>前面更新了设备树，注意更新。</p>
<h3 id="1-2-加载驱动"><a href="#1-2-加载驱动" class="headerlink" title="1.2 加载驱动"></a><font size=3>1.2 加载驱动</font></h3><p>这个需要加载两个驱动：</p>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">insmod ./virtual_pinctrl_driver.ko</span><br></pre></td></tr></table></figure>

<img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/02IMX6ULL%E5%B9%B3%E5%8F%B0/LV09-pinctrl%E5%92%8Cgpio%E5%AD%90%E7%B3%BB%E7%BB%9F/LV09-01-pinctrl%E5%92%8Cgpio%E5%AD%90%E7%B3%BB%E7%BB%9F-02-%E8%99%9A%E6%8B%9Fpinctrl%E9%A9%B1%E5%8A%A8%E5%AE%9E%E4%BE%8B/img/image-20250402194752814.png" alt="image-20250402194752814" />

<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">insmod ./virtual_pinctrl_client.ko</span><br></pre></td></tr></table></figure>

<img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/02IMX6ULL%E5%B9%B3%E5%8F%B0/LV09-pinctrl%E5%92%8Cgpio%E5%AD%90%E7%B3%BB%E7%BB%9F/LV09-01-pinctrl%E5%92%8Cgpio%E5%AD%90%E7%B3%BB%E7%BB%9F-02-%E8%99%9A%E6%8B%9Fpinctrl%E9%A9%B1%E5%8A%A8%E5%AE%9E%E4%BE%8B/img/image-20250402194819910.png" alt="image-20250402194819910" />

<h2 id="2-pinctrl调试信息"><a href="#2-pinctrl调试信息" class="headerlink" title="2. pinctrl调试信息"></a><font size=3>2. pinctrl调试信息</font></h2><p>开发板的<code>/sys/kernel/debug/pinctrl/</code>目录下，每一个pin controller都有一个目录，比 virtual_pincontroller。里面有很多文件，作用如下：</p>
<table>
<thead>
<tr>
<th align="center">pinctrl的虚拟文件</th>
<th>作用</th>
</tr>
</thead>
<tbody><tr>
<td align="center">pins</td>
<td>单个引脚信息</td>
</tr>
<tr>
<td align="center">pingroups</td>
<td>引脚的组信息</td>
</tr>
<tr>
<td align="center">pinmux-pins</td>
<td>单个引脚的复用信息</td>
</tr>
<tr>
<td align="center">pinmux-functions</td>
<td>function下的group(支持该function的group)</td>
</tr>
<tr>
<td align="center">pinconf-pins</td>
<td>单个引脚的配置</td>
</tr>
<tr>
<td align="center">pinconf-groups</td>
<td>引脚组的配置</td>
</tr>
<tr>
<td align="center">pinconf-config</td>
<td>可以通过写它修改指定设备、指定状态下、指定(组)引脚的config值</td>
</tr>
</tbody></table>
<h3 id="2-1-单个引脚信息"><a href="#2-1-单个引脚信息" class="headerlink" title="2.1 单个引脚信息"></a><font size=3>2.1 单个引脚信息</font></h3><figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta prompt_"># </span><span class="language-bash"><span class="built_in">cat</span> /sys/kernel/debug/pinctrl/virtual_pincontroller/pins</span></span><br><span class="line">registered pins: 4</span><br><span class="line">pin 0 (pin0) virtual_pincontroller</span><br><span class="line">pin 1 (pin1) virtual_pincontroller</span><br><span class="line">pin 2 (pin2) virtual_pincontroller</span><br><span class="line">pin 3 (pin3) virtual_pincontroller</span><br></pre></td></tr></table></figure>

<p>以刚才我们的设备树为例就是：</p>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">cat /sys/kernel/debug/pinctrl/alpha:virtual_pincontroller/pins</span><br></pre></td></tr></table></figure>

<img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/02IMX6ULL%E5%B9%B3%E5%8F%B0/LV09-pinctrl%E5%92%8Cgpio%E5%AD%90%E7%B3%BB%E7%BB%9F/LV09-01-pinctrl%E5%92%8Cgpio%E5%AD%90%E7%B3%BB%E7%BB%9F-02-%E8%99%9A%E6%8B%9Fpinctrl%E9%A9%B1%E5%8A%A8%E5%AE%9E%E4%BE%8B/img/image-20250402194952302.png" alt="image-20250402194952302" />

<h3 id="2-2-引脚的组信息"><a href="#2-2-引脚的组信息" class="headerlink" title="2.2 引脚的组信息"></a><font size=3>2.2 引脚的组信息</font></h3><figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta prompt_"># </span><span class="language-bash"><span class="built_in">cat</span> /sys/kernel/debug/pinctrl/virtual_pincontroller/pingroups</span></span><br><span class="line">registered pin groups:</span><br><span class="line">group: pin0</span><br><span class="line">pin 0 (pin0)</span><br><span class="line"></span><br><span class="line">group: pin1</span><br><span class="line">pin 1 (pin1)</span><br><span class="line"></span><br><span class="line">group: pin2</span><br><span class="line">pin 2 (pin2)</span><br><span class="line"></span><br><span class="line">group: pin3</span><br><span class="line">pin 3 (pin3)</span><br></pre></td></tr></table></figure>

<p>以刚才我们的设备树为例就是：</p>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">cat /sys/kernel/debug/pinctrl/alpha:virtual_pincontroller/pingroups</span><br></pre></td></tr></table></figure>

<img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/02IMX6ULL%E5%B9%B3%E5%8F%B0/LV09-pinctrl%E5%92%8Cgpio%E5%AD%90%E7%B3%BB%E7%BB%9F/LV09-01-pinctrl%E5%92%8Cgpio%E5%AD%90%E7%B3%BB%E7%BB%9F-02-%E8%99%9A%E6%8B%9Fpinctrl%E9%A9%B1%E5%8A%A8%E5%AE%9E%E4%BE%8B/img/image-20250402195210757.png" alt="image-20250402195210757" />

<h3 id="2-3-单个引脚的复用信息"><a href="#2-3-单个引脚的复用信息" class="headerlink" title="2.3 单个引脚的复用信息"></a><font size=3>2.3 单个引脚的复用信息</font></h3><figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta prompt_"># </span><span class="language-bash"><span class="built_in">cat</span> /sys/kernel/debug/pinctrl/virtual_pincontroller/pinmux-pins</span></span><br><span class="line">Pinmux settings per pin</span><br><span class="line">Format: pin (name): mux_owner gpio_owner hog?</span><br><span class="line">pin 0 (pin0): virtual_i2c (GPIO UNCLAIMED) function i2c group pin0</span><br><span class="line">pin 1 (pin1): virtual_i2c (GPIO UNCLAIMED) function i2c group pin1</span><br><span class="line">pin 2 (pin2): (MUX UNCLAIMED) (GPIO UNCLAIMED)</span><br><span class="line">pin 3 (pin3): (MUX UNCLAIMED) (GPIO UNCLAIMED)</span><br></pre></td></tr></table></figure>

<p>以刚才我们的设备树为例就是：</p>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">cat /sys/kernel/debug/pinctrl/alpha:virtual_pincontroller/pinmux-pins</span><br></pre></td></tr></table></figure>

<img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/02IMX6ULL%E5%B9%B3%E5%8F%B0/LV09-pinctrl%E5%92%8Cgpio%E5%AD%90%E7%B3%BB%E7%BB%9F/LV09-01-pinctrl%E5%92%8Cgpio%E5%AD%90%E7%B3%BB%E7%BB%9F-02-%E8%99%9A%E6%8B%9Fpinctrl%E9%A9%B1%E5%8A%A8%E5%AE%9E%E4%BE%8B/img/image-20250402195237959.png" alt="image-20250402195237959" />

<h3 id="2-4-function下的group-支持该function的group"><a href="#2-4-function下的group-支持该function的group" class="headerlink" title="2.4 function下的group(支持该function的group)"></a><font size=3>2.4 function下的group(支持该function的group)</font></h3><figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta prompt_">#</span><span class="language-bash"><span class="built_in">cat</span> /sys/kernel/debug/pinctrl/virtual_pincontroller/pinmux-functions</span></span><br><span class="line">function: gpio, groups = [ pin0 pin1 pin2 pin3 ]</span><br><span class="line">function: i2c, groups = [ pin0 pin1 ]</span><br><span class="line">function: uart, groups = [ pin2 pin3 ]</span><br></pre></td></tr></table></figure>

<p>以刚才我们的设备树为例就是：</p>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">cat /sys/kernel/debug/pinctrl/alpha:virtual_pincontroller/pinmux-functions</span><br></pre></td></tr></table></figure>

<img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/02IMX6ULL%E5%B9%B3%E5%8F%B0/LV09-pinctrl%E5%92%8Cgpio%E5%AD%90%E7%B3%BB%E7%BB%9F/LV09-01-pinctrl%E5%92%8Cgpio%E5%AD%90%E7%B3%BB%E7%BB%9F-02-%E8%99%9A%E6%8B%9Fpinctrl%E9%A9%B1%E5%8A%A8%E5%AE%9E%E4%BE%8B/img/image-20250402195311931.png" alt="image-20250402195311931" />

<h3 id="2-5-单个引脚的配置"><a href="#2-5-单个引脚的配置" class="headerlink" title="2.5 单个引脚的配置"></a><font size=3>2.5 单个引脚的配置</font></h3><figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta prompt_"># </span><span class="language-bash"><span class="built_in">cat</span> /sys/kernel/debug/pinctrl/virtual_pincontroller/pinconf-pins</span></span><br><span class="line">Pin config settings per pin</span><br><span class="line">Format: pin (name): configs</span><br><span class="line">pin 0 (pin0): 0x11223344</span><br><span class="line">pin 1 (pin1): 0x55667788</span><br><span class="line">pin 2 (pin2): 0x0</span><br><span class="line">pin 3 (pin3): 0x0</span><br></pre></td></tr></table></figure>

<p>以刚才我们的设备树为例就是：</p>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">cat /sys/kernel/debug/pinctrl/alpha:virtual_pincontroller/pinconf-pins</span><br></pre></td></tr></table></figure>

<img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/02IMX6ULL%E5%B9%B3%E5%8F%B0/LV09-pinctrl%E5%92%8Cgpio%E5%AD%90%E7%B3%BB%E7%BB%9F/LV09-01-pinctrl%E5%92%8Cgpio%E5%AD%90%E7%B3%BB%E7%BB%9F-02-%E8%99%9A%E6%8B%9Fpinctrl%E9%A9%B1%E5%8A%A8%E5%AE%9E%E4%BE%8B/img/image-20250402195338812.png" alt="image-20250402195338812" />

<h3 id="2-6-引脚组的配置"><a href="#2-6-引脚组的配置" class="headerlink" title="2.6 引脚组的配置"></a><font size=3>2.6 引脚组的配置</font></h3><figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta prompt_"># </span><span class="language-bash"><span class="built_in">cat</span> /sys/kernel/debug/pinctrl/virtual_pincontroller/pinconf-groups</span></span><br><span class="line">Pin config settings per pin group</span><br><span class="line">Format: group (name): configs</span><br><span class="line">0 (pin0): 0x11223344</span><br><span class="line">1 (pin1): 0x55667788</span><br><span class="line">2 (pin2): 0x0</span><br><span class="line">3 (pin3): 0x0</span><br></pre></td></tr></table></figure>

<p>以刚才我们的设备树为例就是：</p>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">cat /sys/kernel/debug/pinctrl/alpha:virtual_pincontroller/pinconf-groups</span><br></pre></td></tr></table></figure>

<img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/02IMX6ULL%E5%B9%B3%E5%8F%B0/LV09-pinctrl%E5%92%8Cgpio%E5%AD%90%E7%B3%BB%E7%BB%9F/LV09-01-pinctrl%E5%92%8Cgpio%E5%AD%90%E7%B3%BB%E7%BB%9F-02-%E8%99%9A%E6%8B%9Fpinctrl%E9%A9%B1%E5%8A%A8%E5%AE%9E%E4%BE%8B/img/image-20250402195414515.png" alt="image-20250402195414515" />

<h2 id="3-修改配置值"><a href="#3-修改配置值" class="headerlink" title="3. 修改配置值"></a><font size=3>3. 修改配置值</font></h2><p>在内核源码中为我们提供了下面的函数来修改配置值</p>
<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// drivers/pinctrl/pinconf.c</span></span><br><span class="line">    pinconf_dbg_config_write()</span><br></pre></td></tr></table></figure>

<p>如果pin controller驱动程序中的pinconf_ops提供了pin_config_dbg_parse_modify函数，就可以通过<code>pinconf-config</code>文件修改某个pin或某个group的配置值。</p>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta prompt_"># </span><span class="language-bash">格式: modify &lt;config&gt; &lt;devicename&gt; &lt;state&gt; &lt;pin_name|group_name&gt; &lt;newvalue&gt;</span></span><br><span class="line">echo &quot;modify config_pin virtual_i2c default pin0 0xaabb&quot; &gt; /sys/kernel/debug/pinctrl/virtual_pincontroller/pinconf-config</span><br><span class="line"></span><br><span class="line">cat /sys/kernel/debug/pinctrl/virtual_pincontroller/pinconf-config</span><br></pre></td></tr></table></figure>

<p>以上面的设备树为例就是：</p>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">echo &quot;modify config_pin virtual_i2c default pin0 0xaabb&quot; &gt; /sys/kernel/debug/pinctrl/alpha:virtual_pincontroller/pinconf-config</span><br><span class="line"></span><br><span class="line">cat /sys/kernel/debug/pinctrl/alpha:virtual_pincontroller/pinconf-config</span><br></pre></td></tr></table></figure>

<img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/02IMX6ULL%E5%B9%B3%E5%8F%B0/LV09-pinctrl%E5%92%8Cgpio%E5%AD%90%E7%B3%BB%E7%BB%9F/LV09-01-pinctrl%E5%92%8Cgpio%E5%AD%90%E7%B3%BB%E7%BB%9F-02-%E8%99%9A%E6%8B%9Fpinctrl%E9%A9%B1%E5%8A%A8%E5%AE%9E%E4%BE%8B/img/image-20250402200113056.png" alt="image-20250402200113056" />

<p>不过上面失败了，没太搞明白为啥，不过这里主要是了解虚拟pinctrl子系统的实例，这里先不管了，后面有需要再说。</p>

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    <p><span>文章标题:</span><a href="/post/65aa9737.html">LV09-01-pinctrl和gpio子系统-02-虚拟pinctrl驱动实例</a></p>
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